Please note that the secondary screenshots were taken before the 08/04/15 update, and thus show the old top bar. The main screenshot shows the current appearance of the top bar.

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Changelog

19/02/15 ULTRA UPDATE: NOW APPLIED TO INBOX, HELP, SETTINGS, SEARCH, TAGS.
22/02/15 ALSO APPLIED TO ACTIVITY, BLOGS.

21/04/15 ULTRA UPDATE 2: TOOK FULL ADVANTAGE OF THE REMOVAL OF THE SIDEBAR TO INCREASE WIDEVIEW WIDTH TO 100%.

Items removed

• From top bar
  • Explore Compass
  • 29/01/15 Placeholder text inside search bar
• From side bar
  • 09/04/15 The entire side bar on the dashboard
  • "Account" title
  • "Find Blogs" button
  • "Recommended Blogs" section (23/01/14 re-removed after Tumblr update)
  • "Explore all of Tumblr" button
  • "Radar" section
  • Explanation of inbox
  • Descriptions of help options
• From other
  • "Buy" button on etsy posts
  • Back to top button
  • Next/Previous/First page buttons
  • New post bar on first page (18/01/15 re-removed after Tumblr update) (08/03/15 also applied to /tagged/ page)
  • 17/02/15 Sponsored links
  • 17/02/15 Source prefix
  • Recommended blogs inline with posts
  • 01/05/15 Sponsored posts in frames

Items modified

• New post button is now grey and rounded (17/04/15 Tumblr now uses an SVG file which cannot be changed via userstyle)
• Side bar is sticky'd to the page while scrolling
• 20/01/15 Side bar is mostly hidden until hovered over (23/01/14 Re-hidden with Tumblr update)
• 16/02/15 Wide view
• 16/02/15 XKit support
• 19/02/15 Corrected some formatting issues
• 19/02/15 Search options sticky'd to the page while scrolling
• 22/02/15 Fixed notes page backgrounds
• 08/03/15 Scrollbar matches tumblr background (Chrome only) (09/04/15 Redid the design for more usability) (17/04/15 Changed thumb colour to blue)
• 09/04/15 Wideview width increased on dashboard due to the update removing the need for a sidebar